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Image processing using processing by bands and fixed-size work buffer

a band and work buffer technology, applied in the field of image processing apparatus, to achieve the effect of increasing memory

Inactive Publication Date: 2005-11-17
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] The present invention has been made to solve the above-described conventional problems, and has its object to provide a high-quality image processing apparatus and image processing method capable of image transfer processing by using a fixed size work buffer, even if different decoding methods are used, without physically increasing the memory.

Problems solved by technology

However, in known decoding methods, it is necessary to temporarily store decoded data in a buffer before video transfer is performed to a printer engine.

Method used

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  • Image processing using processing by bands and fixed-size work buffer
  • Image processing using processing by bands and fixed-size work buffer
  • Image processing using processing by bands and fixed-size work buffer

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first embodiment

[Construction]

[0035]FIG. 1 is a cross-sectional view showing the structure of a laser beam printer (hereinafter abbreviated to “LBP”) according to an embodiment of the present invention. The LBP is capable of character pattern registration from a data source (not shown) and fixed format (form data) registration.

[0036] In FIG. 1, reference numeral 1000 denotes an LBP main body which inputs and stores character information (character code), form information or a macro command supplied from an externally-connected host computer, generates a corresponding character pattern or a form pattern in accordance with the information, and forms an image on a print sheet as a printing medium.

[0037] Numeral 1012 denotes an operation panel having switches for operation, an LED display and the like; and 1001, a printer control unit which controls the overall LBP 1000 and interprets character information or the like supplied from the host computer. The control unit 1001 mainly converts character i...

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PUM

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Abstract

A high-quality image processing apparatus capable of performing image transfer processing using a predetermined work buffer even if different decoding methods are used, without physically increasing the memory capacity. Image data in page description language is inputted into a host I / F unit from an external device such as a host computer. At step S302, a print mode of the input data is examined and a coding method is selected. Next, at step S303, a decoding method corresponding to the coding is checked, and at step S304, a band height (width) is set in correspondence with the decoding method. If the decoding method is a non-realtime decoding method, the band height is reduced to half of that in case of realtime decoding method.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an image processing apparatus, having a function to perform rasterizing in band units, performs rendering, and an image processing method. BACKGROUND OF THE INVENTION [0002] Conventionally, as an image processing apparatus of this type, a so-called page printer is known. In this apparatus, image processing is performed while holding raster data for one page in a raster memory. The raster data in such image processing apparatus includes not only text but also various images such as a simple figure and a photograph. [0003] In recent years, the resolution of this image processing apparatus has improved, and the memory capacity necessary in accordance with the improvement in resolution has increased. For example, in a resolution of 600 dpi, for generating data for an A4-sized page, a 4 MByte memory is required. The tonality, with which 1 pixel has been conventionally represented by 2 levels, has improved from 16 (4 bits) to ...

Claims

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Application Information

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IPC IPC(8): G06F3/12B41J5/30G06K9/46G06K15/12H04N1/21H04N1/41H04N1/413
CPCG06K15/12G06K15/1863G06K15/1861
Inventor WAKANA, TORU
Owner CANON KK
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